Improved toner particles having a core-shell structure and related processes thereof are provided. The core of the toner comprises a first polymer, a complexed cationic dye pigment, and a heteropoly acid, and the shell comprises a second polymer. The heteropoly acid can effectively retain the complexed cationic dye pigment within the toner particle by complexing with one or more of the pigment cations, thereby improving the toner properties such as parent charge.